TS ISO 11843-2

TS ISO 11843-2 presents a methodology for assessing capability of detection in measurement systems when the calibration function is linear. The standard addresses how to estimate, from experimental data, the critical values and the minimum detectable value of the net state variable, particularly for cases where the standard deviation is constant or changes linearly with the net state variable. In practical terms, it is concerned with separating a real analytical or physical effect from ordinary measurement variability.

What capability of detection means in practice

Capability of detection describes how well a measuring method can distinguish a small true effect or low-level presence from background noise. In this context, the net state variable is the quantity linked to the calibration model, such as concentration, amount, or another relevant property, while the response variable is the measured output of the instrument or method. When the calibration relationship is linear, interpretation is simpler, but the behavior of measurement spread still matters: a constant standard deviation and a standard deviation that varies linearly with the net state variable are not treated in the same way.

Methodological focus of this part

• Estimating the critical value of the net state variable
• Estimating the critical value of the response variable
• Estimating the minimum detectable value of the net state variable
• Using designed experiments in the linear calibration case
• Deriving characteristics from experimental data under constant or linearly related standard deviation assumptions

As general technical context, this type of methodology is used in laboratory measurement, quality control, environmental analysis, and similar settings where decisions depend on whether a measured signal is meaningful. The key distinction is between merely observing a response and establishing, with statistical basis, that the response corresponds to a detectable net state. This standard therefore provides a structured framework for users who need data-based detection limits in calibration-oriented measurement systems.